<template>
  <div>
    <el-upload
      multiple
      class="upload"
      action="/shuzhongtianApi/oss/uploadFilePicture"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="handleRemove"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }"
    >
      <i class="el-icon-camera"></i>
      <div>添加照片</div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible" width="800" append-to-body>
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script>
import { delpictureApi } from '@/api/mission'
export default {
  name: 'upload',
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg']
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    }
  },
  data () {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: '',
      dialogVisible: false,
      hideUpload: false,
      headers: {
        token: this.$store.getters.userInfo.token
      },
      fileList: [],
      delList: []
    }
  },
  watch: {
    value: {
      handler (val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',')
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            item = { name: item, url: item }
            return item
          })
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip () {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  methods: {
    // 删除图片
    // eslint-disable-next-line no-unused-vars
    handleRemove (file, fileList) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name)
      if (findex > -1) {
        this.fileList.splice(findex, 1)
        this.delList.push(file.url)
        this.$emit('input', this.listToString(this.fileList))
      }
    },
    // 删除
    async removeOss () {
      this.delList.map(async item => {
        await delpictureApi({ filename: item })
      })
    },
    // 上传成功回调
    handleUploadSuccess (res) {
      console.log(res.data)
      if (res.code === 200) {
        this.uploadList.push({ url: res.data })
        if (this.uploadList.length === this.number) {
          this.fileList = this.fileList.concat(this.uploadList)
          this.uploadList = []
          this.number = 0
          this.$emit('input', this.listToString(this.fileList))
        }
      }
    },
    // 上传前loading加载
    handleBeforeUpload (file) {
      let isImg = false
      if (this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
      } else {
        isImg = file.type.indexOf('image') > -1
      }
      if (!isImg) {
        this.$message.error(
          `文件格式不正确, 请上传${this.fileType.join('/')}图片格式文件!`
        )
        return false
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$message.error(`上传头像图片大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      this.number++
    },
    // 文件个数超出
    handleExceed () {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传失败
    handleUploadError () {
      this.$message.error('上传图片失败，请重试')
    },
    // 预览
    handlePictureCardPreview (file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
    },
    // 对象转成指定字符串分隔
    listToString (list, separator) {
      let strs = ''
      separator = separator || ','
      for (const i in list) {
        strs += list[i].url.replace(this.baseUrl, '') + separator
      }
      return strs !== '' ? strs.substr(0, strs.length - 1) : ''
    }
  }
}
</script>
<style lang="scss" scoped>
// 上传图片
.upload {
  max-height: 100px;
  i {
    font-size: 0.35rem;
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -0.35rem;
    margin-left: -0.175rem;
  }
}
::v-deep .el-upload--picture-card {
  max-width: 100px !important;
  max-height: 100px !important;
  position: relative;
}
::v-deep .el-upload-list--picture-card .el-upload-list__item {
  max-width: 100px !important;
  max-height: 100px !important;
}

::v-deep.hide .el-upload--picture-card {
  display: none;
}
</style>
